If you remove the BB, it should have the sizings written on it. If not, or you haven't remove it then you will have to;

measure the spindle length, you may have to remove the cranks to do this accurately.Then you need the width of the BB required. To do this, measure the width of the shell on the frame which you insert the BB into.

Once you ID the BB and then get those two measurements, you can select your required BB. I ended up sourcing a replacement cartridge BB from Amazon for cheaper than I could anywhere else.

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